Circular motion question: Mass on a rod rotating in a vertical circle

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Homework Help Overview

The discussion revolves around a problem related to circular motion, specifically focusing on the forces acting on a mass attached to a rod that is rotating in a vertical circle. Participants are examining the representation of forces, particularly the force exerted by the rod on the mass.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the representation of the force exerted by the rod on the mass, with some expressing confusion about the direction of this force compared to the weight of the ball. There is also a query regarding the direction of the acceleration of the mass.

Discussion Status

The discussion is ongoing, with participants seeking clarification on the forces involved and their representations. Some guidance has been offered regarding Newton's laws, but no consensus has been reached on the specific representations or interpretations of the forces.

Contextual Notes

There appears to be some confusion regarding the forces acting on the mass, particularly in distinguishing between the weight of the ball and the force from the rod. Participants are encouraged to clarify these aspects without a definitive resolution provided.

yusungmagic
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Homework Statement
A mass is attached to the one end of a rod and made to rotate with constant speed in a vertical circle.
Relevant Equations
Free Body Diagram
By looking at the following question, I have no idea why the direction of force exerted by rod on a ball is represented like that. can anyone help me to understand?
Screenshot 2024-10-24 at 6.44.05 PM.png
 
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yusungmagic said:
I have no idea why the direction of force exerted by rod on a ball is represented like that.
Like what? The only force I see represented is the weight of the ball. You are asked to add a representation of the force from the rod.
 
sorry for the confusion, you are supposed to draw a force exerted on the mass by the rod. not the "W"
 
yusungmagic said:
sorry for the confusion, you are supposed to draw a force exerted on the mass by the rod. not the "W"
Have faith in Newton's laws! In particular, ##\vec F = m \vec a##
 
yusungmagic said:
sorry for the confusion, you are supposed to draw a force exerted on the mass by the rod. not the "W"
What is the direction of the acceleration of the mass?
 

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